Meaning
Time delay between the moment a signal reaches the antenna and the moment the processed data is available to the application layer. This receiver latency is a combination of the hardware propagation delay, the demodulation time and the software processing overhead in the protocol stack. Minimizing this duration is essential for time-sensitive applications such as industrial automation or remote control of autonomous vehicles.
Hardware Processing
Analog to digital conversion and initial filtering introduce a fixed amount of time into the signal path. The receiver latency begins as the radio waves are converted into an electrical signal and sampled by the baseband processor. Fast digital signal processing chips can reduce this time by performing complex calculations in parallel.
However, the laws of physics and the requirements of signal integrity set a floor on how low this hardware delay can be.
Buffer Management
Incoming data packets are often held in memory while they are reassembled or checked for errors. A large buffer can smooth out variations in the data rate but adds significantly to the total receiver latency. In streaming applications, the system must balance the need for a stable playback against the requirement for low delay.
If the buffer is too small, the system may drop packets during periods of high network congestion, leading to data loss.
System Integration
Interaction between the communication module and the host processor is the final component of the overall delay. High speed interfaces like USB or PCIe help to keep the receiver latency low by moving data quickly between the two systems. Software drivers and the operating system scheduler also play a role in how fast the data is delivered to the final application.
Measuring this end-to-end delay requires specialized test equipment that can synchronize events across different parts of the network.
